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The 8000 series includes 8011, 8090, 8091 and 8093. Lithium has a significantly lower density than aluminum because its solubility is also relatively high, and it can significantly reduce the density in a sufficient amount of aluminum alloys (usually about 10%, less than other aluminum alloys). Not only causes the alloy to increase its stiffness, but also responds to age hardening. In addition, the resistance to fatigue crack growth increases at intermediate pressure levels. This attractive combination of properties has led to great interest, especially for aerospace applications. These alloys have a high volume fraction of coherent, ordered LiAl 3 precipitation, which is responsible for these properties. Silicon strength: For example, the 8011 alloy is based on Al-Fe-Si, but more than 1% of the total alloying elements give a correspondingly higher advantage.